Why to avoid referring to too many books ?

I would also suggest you not to read many books instead just choose one or two and stick to them because :

1. Referring to too many books may sometime create confusion because of different approach followed to make student understand about a concept
2. Referring to too many books can be time consuming & qualitative studies can be hampered
3. You will find yourself in troublesome situation while revising the syllabus as you have to pick many books
4. If you choose one/two books then your hold on the topics will be very good
5. You will gain maximum confidence once you will be done with your revision on time
6. You will have ample time to practice 10 years (which I believe is also most important for NET exam)